Planet Zor has mass and radius

PHYSICS · Single correct · CBSE · Physics · Gravitation · Gravitation

Problem

Planet Zor has mass

0.2M_E

and radius

0.5R_E

, where

M_E

and

R_E

are Earth’s mass and radius. An object is dropped from rest and falls vertically through

10\,\text{m}

on Zor. Approximately how much time does the fall take? (Take

g_{\text{Earth}} = 9.8\,\text{m/s}^2

; neglect any atmosphere.) (a)

2.3\,\text{s}

(b)

1.3\,\text{s}

(c)

1.6\,\text{s}

(d)

3.2\,\text{s}